Pulp treatment



25, 1942- J. A WIENER PULP TREATMENT Filed Oct. 24, 1939 2 Sheets-Sheet I Wiener, w, M4 15M 25, 4 T J. A. WIENER v 2,294,060 I PULP TREATMENT Filed Oct. 24, 19?? 2 Sheets-Sheet 2 v wand. VVien/er,

I extent, or accepted. a

Patented Aug. 25, 1942 UNITED STATES PATENT OFFICE,

PULP TREATMENT j John A. Wiener, Emporia, Va., assignor to Downingtown Manufacturing a corporation of Pennsylvania ApplicationbctoberM,1939, Serial K013131337 2 Claims. (oi. sat-2s) This invention relates to pulp treatment, more particularly wood pulp. although not so limited.

The primary object of the invention is to provide improved means for expeditiously refining the waste products of paper mills, such as tailings,-or'-other coarse and rejected fibers, to a predetermined degree, more specifically by initially charging a receiver with material to be refined, having screening means therein, and therefrom after screening, passing the mass into a grinder, then after grinding .returning the ground mass into the receiver to be screened, and again returning the rejected or unaccepted portion of the mass to.the grinder, which process is continuously repeated adinflnitum, until the entire charge is ground to the predetermined A further object of the invention is to provide an apparatus of this type, wherein the rte-- ceiver or. hopper is separate from the grinder and functions to not only receive and convey the charge to the grinder, but also cooperates with the screening mechanism, thereby serving in a dual capacity.

The invention further aims to increase the capacity of an apparatus of this type, without increasing the size of the grinder.

00., Downingtown, Pm,

with a'shaft d, driven by, a motor 5', extending through the casing and having thereon a grinding member 5, provided withamally extending cutting blades 6, and also blades 6', which propel or force the material from the inlet 2, to the outlet 3. gard that any form of grinder suitable for the ,purpose, having aninletand outlet, and propellirig means can be used, since same forms no part of the invention. 7

A receiver or hopper -l, is provided and is spaced fromthe grinder, preferably located above the'grinder and supported in a fixed positionin any suitable manner, herein shown as vertically disposed posts 8,-the upper ends of which are received'within. sockets 9, iormed on the periphery of the receiver. The lower end a of the hopper is of funnel formation as shown a at 9, and has its lower terminal connected by Still further, the invention aims to provide means for more expeditiously screening the charge by subjecting same toa scraping action during. screening. r

Still further, the invention aims to provide an apparatus of this character which is attachable to grinders of present-day type, such as generally illustrated in my -Patent No. 1,939,747,

Fig. 4 is a section on line 4-4 of Fig. 3, showing the screening apparatus.

In proceeding in accordance with the present invention, a grindingapparatus is shown, which generally maybe of the character disclosed in my said patent, and which briefly involves a casing I, having an inlet 2, and an outlet 3,

a pipe H, to the inlet 2, of the grinder. A pipe or conduit I2, is connected to the outlet 8, of

thegrinder and'has an elbow |3,-at its upper end, whichextendsinto the upper portion of the hopper substantially tangential thereto, so as to discharge material from the grinder into the hopper.

For the purpose of screening the material within the hopper, a drum-like or cylindrical member ll, is provided, the top l5, of which is inated top of the The shaft I8 may be supported by a journal and strut 20, the latter rigidly secured to the top of the hopper as deforaminated, the foraminations being of predetermined size so as to enable pulp of predetermined size to pass therethrough. As depicted in Fig. 4, the drum M, has a closed bottom 14' to which is connected a conduit IS, the latter conducting the screened or refined pulp to any selected external point, not shown. Struts II, are secured to the bottom of the drum and, to: the interior of the hopper, so as to support the drum with its bottom adjacent the upper end of the funnel-like portion ll, of the hopper.

For the purpose of constantly maintaining the' top of the screening apparatus free of any fibers of a size which might partially enter the foraminations of'the screen and thus clog the latter, as well as to macerate smaller particles, susceptible to easy reduction in size and hence accept-' able, a scraping mechanism is provided, which consists of a shaft 18, having a series of radially extending scraping blades is, secured to its lower-end. The blades as clearly shown in Figs. 3 and 4 have a wiping action against the formpicted in Figs. 1 and 2. Likewise the shaft l8 It will be understood in this re-' Asshown particularly in Fig.8 of the drawings, the unrefined mass returned to the hopper by the grinder, through pipe or conduit I2, and its elbow l3, which latter constitutes a nozzle, enters the hopper substantially tangential thereto, the mass being impinged against the hopper walls and thereby given a swirling motion, or vortex, so as to facilitate screening. The mass accordingly is agitated, and thereby opportunity for entry of the screenable fibersIinto the screen is materially increased, augmented by the nozzle ll discharging the material above the screening mechanism, so that the swirl is initiated above the latter.

In operation, the charge of a slurry of coarse fibers, which is to be converted into acceptable stock, which consists of waste products of paper mills, suchas tailings and other coarse fibers, is introduced into the hopper in any suitable manner, for example through a pipe l3 and initially screened therein, assisted by the scraping blades which act to macerate encountered fibers and hence render same acceptable to the screening apparatus, as well as to'sweep oil fibers of excessive size. All rejected fibers gravitate through the space between the drum l4, and

hopper, and from the latter into the funnel l0,

and then enter the inlet to the grinder where the fibers are ground. After grinding the fibersare forced by the grinder upwardly through the outlet'S, and conduit,l2l3, and are returned to the hopper I, where they are again subjected to the screening action, which process is completed until the charge is completely'accepted by the screening or refining apparatus.

With the present invention, however, andrwith the screening apparatus-formed and acting independently, and located exteriorly, of the grinding apparatus as distinguished from my aforesaid In addition, in the present invention, by virtue of the scraping and macerating of the fibers simultaneously with screening increases the speed of operation or capacity of the apparatus in refining a charge, or constantly occurring orcontinuous charges of coarseffibers.

The hereindescrib'ed embodiment of the.inven-' f tion, it is to be understood, is byway of example, and is subject to all changes, alterations and modifications, that fall within the spirit and scope of the invention, as announced by the following claims. i

What is claimed is: g

1. A fibrous pulp treating apparatus including a receiver, an accepted stock chamber disposed within and spaced from. the receiver, screening means disposed between the receiver and chamber, a grinder having'aninlet, a conduit connecting the inlet with said receiver to convey material rejected by the screening means to the grinder, a conduit communicatingwith 'the chamber and screening means for conducting materialscreened by the latter toa point externally of the receiver, said'grinder having an outlet and a conduit connected to the outlet and to the receiver for conveyingithe ground material back into the receiver for rescreening; the receiver, the two conduitsconnected to same and to the grinder, and the .latter conjointly forming a continuous circuit ffor the mass to be screened until accepted byithe screening means,

and means for operating the grinder so as to grind and also force the material ground thereby into the second conduitand thence back into the receiver.

2. A fibrous pulp treating apparatus in accordance with claim 1, wherein the receiver has curved sides. and wherein the conduit for conveying the ground material into the receiver has an outlet disposed tangential to the receiver and above the screening means for-discharging the ground material against the curved sides of the receiver thereby to impart a swirling movement to -the ground material, above the screening means.

JOHN A. 

